[PATCH] x86: fix compile waring building without CONFIG_SYSCTL

[Li Zefan <lizf@cn.fujitsu.com>]

building without CONFIG_SYSCTL:

arch/x86/kernel/nmi_64.c:50: warning: 'unknown_nmi_panic_callback' declared 'static' but never defined

This patch also fixes nmi_32.c

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>

---
 arch/x86/kernel/nmi_32.c |    3 ++-
 arch/x86/kernel/nmi_64.c |    3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/nmi_32.c b/arch/x86/kernel/nmi_32.c
index edd4136..7e5ee4f 100644
--- a/arch/x86/kernel/nmi_32.c
+++ b/arch/x86/kernel/nmi_32.c
@@ -46,8 +46,9 @@ static unsigned int nmi_hz = HZ;
 
 static DEFINE_PER_CPU(short, wd_enabled);
 
-/* local prototypes */
+#ifdef CONFIG_SYSCTL
 static int unknown_nmi_panic_callback(struct pt_regs *regs, int cpu);
+#endif
 
 static int endflag __initdata = 0;
 
diff --git a/arch/x86/kernel/nmi_64.c b/arch/x86/kernel/nmi_64.c
index fb99484..8fff383 100644
--- a/arch/x86/kernel/nmi_64.c
+++ b/arch/x86/kernel/nmi_64.c
@@ -46,8 +46,9 @@ static unsigned int nmi_hz = HZ;
 
 static DEFINE_PER_CPU(short, wd_enabled);
 
-/* local prototypes */
+#ifdef CONFIG_SYSCTL
 static int unknown_nmi_panic_callback(struct pt_regs *regs, int cpu);
+#endif
 
 /* Run after command line and cpu_init init, but before all other checks */
 void nmi_watchdog_default(void)
-- 
1.5.4.rc3